.top{
    height: 100px;
    background-color: pink;
}
.cen{
    height: 60px;
    background-color: #c7000b;
    position: sticky;
    top: 0px;
}
.bot{
    height: 1000px;
    background-color: skyblue;
}
ul{
    width: 1233px;
    height: 60px;
    margin: 0 auto;
    position: relative;

}
li{
    width: 175px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    border-right: 1px solid rgba(0,0,0,0.2);
    font-weight: 600;
    color: white;
    float: left;
    margin-top: 15px;
}
.one{
    border-left:  1px solid rgba(0,0,0,0.2);
}
.menu{
    width: 1233px;
    height: 300px;
    position: absolute;
    top: 60px;
    left: 0;
    background-color: #ffffff;
    border: 1px solid rgba(0,0,0,0.5);
    display: none;
}
li:hover{
    background-color: #af0812;
}
li:hover .menu{
    display: block;
}